Man-made versus natural climate change

Article Abstract:

The causes of climate change, either activities of human beings and the greenhouse effect or some natural processes outside the control of humans, are discussed with information about various aspects of setting up a physical model of the climate system to be used for investigation into climate processes. In a Holocene perspective it is not clear that global mean surface temperatures of the most recent 100 years are unusual, but for the most recent 600 years the temperatures are apparently unprecedented, and the rapid warming since 1975 cannot be explained by changes in volcanic activity or in solar radiation.

Sweden, Causes of, Human beings, Human-environment interactions, Climatic changes, Climate change, Climatic factors

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Acidification in developing countries: ecosystem sensitivity and the critical load approach on a global scale

Article Abstract:

Data from atmospheric transfer models is presented on the environmental risks posed by acid deposition to ecosystems within developing countries. The models are derived from information on sulfur emissions and alkaline soil dust. Findings show a significant increase in environmental risk specifically for southern Africa and for eastern and southern Asia compared to risk data from 1990.

Africa, Southeast Asia, Risk assessment, Demographic aspects, Developing countries, Acid deposition, Soil acidification

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Soil functional responses to excess nitrogen inputs at global scale

Article Abstract:

Interaction of climate, soil type and species composition on nitrogen (N) cycling processes that is fundamental to predicting the fate of N in ecosystems is discussed. It was found that many southern temperate forests remain little affected by anthropogenic N and are valuable experimental sites for process-based studies.

Europe, North America, Nitrogen cycle, Terrestrial ecosystems

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